Due to value being determined by people subjectively, people have different valuations of things. Thus, people are able to trade the things they don't need or want for things they need or want. Both parties are benefitted by the trade.
Istanbul is Turkey's leading center of trade and culture.
Once you trade and get things from other places, you learn about the culture and what the people are like. Thus, culture, or certain aspects of a culture, can spread.
A person (you asked "who") can not be a center of trade and culture that would need to be a place such as London.
maybe...........
the Olmec culture spread by trade centerso
Introduced them to a new culture and eventually led them to participate in slave trade with Europeans.
Culture strike happened in 2005.
Sub Culture happened in 1997.
The Ottoman Empire tried to resist European Trade and Culture but were not terribly effective in doing either, especially at resisting European Culture.
It protects the people that make the items of trade,
trade,teach
trade influences culture regardless of distance.